Why does the Zelda series exclusively focus on Ganondorf as an antagonist?

[SaviorX]

I wouldn't mind a new villain, but I wouldn't be upset if Ganondorf was there. As long as the final battle isn't the same as past entries in the series, I would be OK.

I still say Dark Link from the Water Temple in OOT should reappear, but that may be too cliche. Whatever Nintendo chooses to do, please don't make it terrible like the Final Battle against Skull Kid in Majora's Mask.